We present color-magnitude diagrams for a number of open and
globular cluster in Sloan Digital Sky Survey (SDSS) filters.

The SDSS has been obtaining engineering and commissioning
imaging data for over a year, and the survey is expected to
begin in earnest in early 2000. The SDSS imaging camera
utilizes a five-band (u'g'r'i'z') photometric system which
will rapidly generate more photometric data than has been
obtained in the entire history of astronomy.

In order to exploit the full capabilities of the SDSS data
set, it is essential that we tie the SDSS photometric system
to physical properties of observed stellar populations. To
first order, this can be done by using transformation
equations to convert UBVRI stellar data into the SDSS
system. The color-magnitude diagrams presented are based on
observations made with the 0.9m Schmidt at CTIO and the 0.5m
SDSS photometric telescope. We use them to study age and
metallicity effects within the SDSS system. This will both
facilitate the recalibration of existing models of stellar
systems and lead to a better understanding of the
u'g'r'i'z' system as a whole.

This work was supported by the U.S. Department of Energy
under contract No. DE-AC02-76CH03000.

The author(s) of this abstract have provided an email address
for comments about the abstract:
stoughto@fnal.gov